CONTENTS 
PLATES I -XV. 
PAGES 
INTRODUCTION . : 65 
MORPHOLOGY OF THE VEGETATIVE ORGANS 69 
STEM 69 
A. Goleral (Ghamacters 69 
B. Branching : : ; 69 
1. Branching in Ruppia maritima 69 
a. Vegetative Branch System 69 
b. Inflorescent Branch System 71 
2. Comparative Study of the Branching of the Patanoae: 
tonaceae : ° ; : ; te 
C. Anatomical Structure 74 
1. Growing Point : 74 
2. Stem Structures in the Wemctitive Region 75 
a. Upright Stem 75 
(1) Epidermis 75 
(2) Cortex : 75 
(a) Outer Cortex . 76 
(b) Middle Cortex Crs 
(c) Inner Cortex . CE 
(3) Endodermis 78 
(4) Vascular System 73 
(a) Course of Vascular Bundles 78 
(b) Structure of Vascular Bundles 80 
b. Rootstock . : 82 
3. Stem Structures in the Floral Repion 83 
a. Peduncle 83 
(1) General Characters 83 
(2) Anatomical Structure 83 
(3) Coiling of the Peduncle 85 
b. Rhachis ; 85 
c. Stipe . 85 
4. Brief Comparative Goad of the Sten eons a ie 
Potamogetonaceae 86 
Lear , 86 
A. ae nisvcoai of ianald ot ere 86 
B. Arrangement 86 
C. Ordinary Foliage Beste es ST 
